i keep getting Process returned -1073741819 (0xC0000005) whenever I run this code, what's the reason?

<pre><pre lang="C++"><pre lang="C++">

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bool autoregex(string test){
    regex e ("[-+]?([0-9]*\.[0-9]+|[0-9]+)");
   if (regex_match (test,e))
        return true;

    return false;
}
bool autrege(string test){
    regex aret("SIN|LOG|sqrt|sin|log|tan|pi|e|ln|EE|[^0-9a-z$@#&]");
               if (regex_match (test,aret)){
                return true;
               }

    return false;
               }
               void namehere(string test){
if(autrege(test) == true){
regex bret("[+-]");
regex cret("[/*xX]");
regex dret("SIN|LOG|sqrt|sin|log|tan|pi|!|e|ln|EE|\\^");
regex omega("\\)");
regex canmae("\\(");
if (regex_match (test,bret)){num2 = 1;};
if (regex_match (test,cret)){num2 = 2;};
if (regex_match (test,dret)){num2 = 3;};
if (regex_match (test,omega)){num2 = 4;numaltt = numaltt + 1;};
if (regex_match (test,canmae)){num2 = 4;numalt = numalt + 1;};
}




               }

int main()
{
vector<double> vec;
    again = "n";

 while(again == "n"&&abrt == 0){
        // queue<double> numbers; stack<int> pres;
        queue<string> output;
   int test;
 string name;
   getline(cin, name);
   istringstream iss(name);
 string token;
    while(iss >> token)
    {
      if(autoregex(token) == true){
            output.push(token);
      }
      if(autrege(token)== true)//token area
      {


          namehere(token);
          num6++;
       while(presedence.empty() == 1 && oprators.empty() == 1)
        {
            presedence.push(num2);
            oprators.push(token);
       }
       while(presedence.top() < num2)
        {
        oprators.push(token);
        presedence.push(num2);

       }
while(presedence.top() == num2 && presedence.empty() == 0){
        cout<<"works?"<<endl;cout<<presedence.empty()<<endl;
        cout<<oprators.top()<<endl;
        output.push(oprators.top());
        oprators.pop();
        presedence.pop();
}
       while(presedence.top() > num2)
       {
        output.push(oprators.top());
        oprators.pop();
        presedence.pop();
       }
//3-T 2-ME 
      }

}
while(presedence.empty() != 1 && oprators.empty() != 1){  output.push(oprators.top());
oprators.pop();presedence.pop();}
while(!output.empty()){cout<<output.front()<<", ";output.pop();}

}

What I have tried:

I've tried changing the revamping the entire code to include an error case, tried checking if the stack was empty before popping, didn't work still, I tried removing the precedence system, didn't work, I've got no ideas on what to do now